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btrfs: add dummy callback for readpage_io_failed and drop checks 

Make extent_io_ops::readpage_io_failed_hook callback mandatory and
define a dummy function for btrfs_extent_io_ops. As the failed IO
callback is not performance critical, the branch vs extra trade off does
not hurt.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-02-17 16:24:29 +01:00
parent 20c9801d39
commit 20a7db8ab3
4 changed files with 10 additions and 3 deletions
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2
fs/btrfs/disk-io.c
View File

@ -4658,7 +4658,7 @@ static const struct extent_io_ops btree_extent_io_ops = {
.readpage_end_io_hook = btree_readpage_end_io_hook,
/* note we're sharing with inode.c for the merge bio hook */
.merge_bio_hook = btrfs_merge_bio_hook,
.readpage_io_failed_hook = btree_io_failed_hook,
/* optional callbacks */
.readpage_io_failed_hook = btree_io_failed_hook,
};

2
fs/btrfs/extent_io.c
View File

@ -2581,7 +2581,7 @@ static void end_bio_extent_readpage(struct bio *bio)
if (likely(uptodate))
goto readpage_ok;
if (tree->ops && tree->ops->readpage_io_failed_hook) {
if (tree->ops) {
ret = tree->ops->readpage_io_failed_hook(page, mirror);
if (!ret && !bio->bi_error)
uptodate = 1;

2
fs/btrfs/extent_io.h
View File

@ -103,6 +103,7 @@ struct extent_io_ops {
int (*merge_bio_hook)(struct page *page, unsigned long offset,
size_t size, struct bio *bio,
unsigned long bio_flags);
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
/*
* Optional hooks, called if the pointer is not NULL
@ -110,7 +111,6 @@ struct extent_io_ops {
int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
u64 start, u64 end, int *page_started,
unsigned long *nr_written);
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,

7
fs/btrfs/inode.c
View File

@ -10509,6 +10509,12 @@ out_inode:
}
__attribute__((const))
static int dummy_readpage_io_failed_hook(struct page *page, int failed_mirror)
{
return 0;
}
static const struct inode_operations btrfs_dir_inode_operations = {
.getattr = btrfs_getattr,
.lookup = btrfs_lookup,
@ -10551,6 +10557,7 @@ static const struct extent_io_ops btrfs_extent_io_ops = {
.submit_bio_hook = btrfs_submit_bio_hook,
.readpage_end_io_hook = btrfs_readpage_end_io_hook,
.merge_bio_hook = btrfs_merge_bio_hook,
.readpage_io_failed_hook = dummy_readpage_io_failed_hook,
/* optional callbacks */
.fill_delalloc = run_delalloc_range,